- Building web server and its interactive functions
- Animations and graphics, adding special effects to web components
- Validating forms and exception errors
- Adding behavior and functionalities to web pages
use strict method
Strict mode forbids some syntax that is anticipated to be defined in future ECMAScript versions.
When comparably “unsafe” actions are taken, it prevents or throws errors (such as gaining access to the global object).
It turns off features that are unclear or poorly designed.
Strict mode can be utilized in two ways. Keep in mind that block statements surrounded in braces will not work in strict mode.
For the entire script, it is used in the global scope.
It can be used for specific functions.
For the full script, use Strict mode: Put the exact statement “use strict”; (or ‘use strict’;) before any other statements to force strict mode for the whole script.
// strict mode syntax
let a = “strict mode script!”;
It is not possible to concatenate non-conflicting scripts using this syntax because it has a flow. Combining a strict mode script with a non-strict mode script is a good idea. The entire concatenation appears to be strict; yet, the opposite is also true. The non-strict plus strict combination appears to be non-strict. It’s fine to concatenate strict mode scripts with each other, and it’s also fine to concatenate non-strict mode scripts. It’s only a problem when strict and non-strict scripts are combined. As a result, it’s best if you enable strict mode function by function (at least during the transition period).
Using Strict mode for a function: To use strict mode for a function, place the exact statement “use strict”; (or ‘use strict’;) before any other statements in the function’s body.
Strict mode can be used in the following ways:
// Using a variable, without declaring it, is not allowed:
x = 3.14; // will throw an error
If you select strict mode, you won’t be able to utilize a variable that hasn’t been declared.
It is not possible to delete a variable (or object) or a function.
It is not permitted to use the same parameter name twice.
The use of octal numeric literals is prohibited.
There are no escape characters permitted.
It is not possible to write to a read-only property.
It is not possible to write to a get-only property.
It is not possible to delete an undeletable property.
It is not possible to use the string “eval” as a variable.
It is not possible to use the string “arguments” as a variable.
The use of the with statement is not permitted.
If you have any queries or feedback do let us know in the comment section.